Phonograph tone arm



June s, 1925. ,542,374

' R. B. DALEY PHONOGRAPH TONE ARM 0 Fid uar 24, 1922 4 Sheets-Sheet R.B. DALEY momenti& TONE ARM Fild March 24, 922 4 Sheets-Sheet 2 June 16,1925.

'R. B. DALEY PHNOGRAPH TONE ARM Filed Marqh 24. 1922 4 Shets-Sheet 5Patented June 16, 1925, i i I I I i 'UNITED ,STATES PATENTSOFFICE.

ROLAND B. DALEY; OF CHICAGO, ILLINOIS.

I j iHoNoGRArH TONE Amit i' Application 'filed March 24, 1922; SerialNo. 5426302.

TO al lwhomitmay concem: F gure is a plan View of a modified Be 'itknown that LVROLAND B. DALEY, a form of tone arin; citizen of the UnitedStates, and residentof F igure 6 is a side elevation'of the toneChicago, in the county of Cook and State arni ofFigure 5; 5 of Illinois,have invented certain new and' *Figure- 7 ;is a vertical sectional ViewGU useful Inprovenents in Phonograph Tone through the base of the tone.arin elhow and Arnis, of which the following is a fu`ll`clear, itssupporting hearing;

concise, and exact description, reference 'be- F igure 8 is a transversesectional View ing had to the accon panying drawings, on thel-ine 8-8 ofFigure 7 looking in'the 'forn'inga part'of this specificationi pdirection of the arrows; i

This in'ventionrelates to phonograph ap- Figure 9 is a sectional Viewthrough the paratus, and particularly to the tone arni, raceway of theball hearing substantially and its support. V on the line 9-9 ofFigure8; A The 'object of the invention; is to pro- Figure 10 is a section onthe line 10--10 15 vide an inprovedtone arin and also iniof F igure 5; Vproved supporting ``neans and counter-bal- Figure ll is a section on theline 11-11 ancing means therefor. I of F igure 5;

One feature of the invention resides in 'Figure 12 is a rear View of thetone'arni the support :for-the tone arin elbow, and the showing thereproduoer counterbalancing ?zo provisiontherein ofgneans for equalizingweight in one of its operative positions in or taking up' the wearof theballs andball which it acts to 'decrease the pressure of race of thebearing. I the reproducer needle on the record;

Another featureresides in the ineans pro- Figure 13 is a similar Viewbut showing vided' for Varying the `pressure of the needle thecounterbalanoin weight in' inoperative 53. of the reproduoer on therecord. e position; i i

Another feature of the invention is `the F gure 14 is a View similar toFigure 12, provision of bracing webs in the passage but showing thecounterbalanoing weight in of the tone arni to' render the tone arin aposition to increase the'pressure of the walls more rigid so as toprevent Vibration reproduoer needle on' the record; i

:: thereofland still' u'other feature is the proj Figure 15 is aVertical sectional View of 55 Vision of neans in association with onetype' the tone arin showing` the strengthening of bracing web 'wherebythe sound waves webs'in place; are forced to pass through a plurality ofFigure 16 .is a cross section on the line perforations 'in thestrengthening Web, thus 16--16 of Figure 15; e

35 clarifying'the sound. Figure 17 is section on the line l7- l7 Otherfeatures and advantages will apof Figure 15; pear frontine to tinie'asthe description Figure 18 is a 'Vertical sectional View of' of theinvention progresses. r the tone arni extension showing a modifiedReferring now to the drawings which type of strengthening web; i

0 show the preferred enbodinents of appli` Figure 19 is a section on theline 19--19 canfis invention, g i g i' of Figure 18; r

Figure l is a plan View of the tone, arin Figure' 20 shows one of thestrengthening partly in section, --andcthe reproducer in awebs used inthe modification of Figure 18;

positionto play lateral cut records; Figure 21 shows astill furthernodified 5 Fignre 2 is a side elevation of the arform of strengtheningweb with the means 10@ rangement of Figure I. associated therewith forcausing the sound In both Figures l and 2, the reproducerto filter.through J perforations in the is shown in its needle changing positionin strengthening web, and dotted lines. p Figure 22 is a section on theline 50 Figur-e 3 is a plan View of the device of of Figure 20. e

Figures l and 2 but showing the reproducer It is thought that thisinvention will be in a position for playing hill and dale reobestunderstood *by a detailed description r ords; e u i thereof takeninconnection with the draw- Fgure 4 is a 'side elevation ot'the devceings. I v 55 of Figure 3; Referring now to the drawings in which meansmay be provided for limiting the ro- ZEF tary movementotthe part 2 3within the r'ecess 22 andfor providing a substantially constant*frictional engagement'between the two parts. suitable means forthispurpose willbe' subsequently described in connection with themodification shown 'in Figures and 6.

The'tone arm extension 24 terminatesat oneend in a portion'25, the axisof which extendsat an 'obliqu e angle to the axis of the member 24. Thereproducer shell 26 has an exit stem 27 .provided with a. "reducedportion 28 telescopically received within the angularly extendingportion of the tone arm eitension. It will be noted that the axis of thesound exit channel 29, and also the azcis of the stem 27, is arranged atan acute angle to the plane o' the reproducer diaphragn This angle ispreferably substantially 4:09. e

This 'invention does not relate to the diaphragm, needle 'support or:any of the inoving parts associated with the reproducer shell. Anydesired or approvedtype of this mechanism may be employed.

The exit stem 27 is rotatable with regard to thetone arm extension, andany suitable or desired means may be provided to limit the relativerotation of these parts, one to the other, or to provide constantfrictional engagement between the two. suitable ineansfor this purposewill be subsequently described.

IrFigures l and 2, the reproducer is shown in solid lines in a. positionfor playing lateral cut records In this position it will be noted thatthe plane of the diaphragm passes through the aXis of rotation ot thevertically extending portion 20 of the tone arm elbow. Ttwill also benoted by reference to Figure 2, that the needle socket 30 and needle 31are arranged at an angle of approximately to the surface of the record32. It is desirable to have the 'axis 'of the reproducer exit channelsubstantially intersect the axis of the diaphragm and the axis of theneedle and needle socket. *In other words,-the axis otthe exit channel,the axis of the needle socket and the azis of the diaphragm should allpass substantially through a common point. p i I It Willbe seen byreference to Figures 1, 2 and 3, that the axis of the tone exitchan'ne129 passesthrough the plane of the diaphragm at substantially thepoint where the stylus bar 33 is attached to the diaphragm 34.

It will also be noted from an inspection of Egi'rel of the drawings,that the vertical plane passing through the axis of the 'exit channel 29`p'a`s`se`s much nearer to the needle point than vould be the case ifthe exit channel eXtended atjan angle of subs tantially to the plahe ofthe diaphragm. Thus the turning `movenent of the force exerted on theneedle point by the record will be less and the danger of displaoementof the rproducer and chatteringthereof is materially reduced.

The needle chan' ing position of the reproducer and needle' is shown indotted lines in Figures l and 2. The rproducer is placed in needlechanging .position by rotating the stem 27 with relatibn to the tone armextension 24. Itwill be. 'noted that when the reproducer is in needle;changing position, it lies :an angle ofsnbstantially 90 with regard toits 'playing psition Also, it Will be noted that the needle,"when thereproducer is in changing position, lies immediately over the positionit occupies when in playing position. lVhen in needle changing position,the needle will point upwardly and outwardly, thus making it exceedinglyconvenientto change the needle.

The reproducer is shown in a position to play hill and dale-records in l`igurcs 3 and 4:. The change from the position of Figures 1 and 2 tothat of Figures 3 and -l is accomplished by 'irstirotating thereproducer to the needle changing position, as above described, and thenrotating the extension 'arm 24: substantially l80 in'relation to thetone arm elboW. The character of the "sound passage through the tone armis in no wise altered by the change of the reproducer from a position toplay lateral cut *records to'a position to play hill and dale records.

In applicant s device, only one movement, in addition to movng 'thereproducer to needle changing position, is necessary in changing the'reproducer from 'a position to play lateral cut=records to a positionto play hill-and dale records, or vice versa. In any-instance, itisnecessary to move the reproducer to needle changing position in order tochange the needle. Having moved the reproducer to needle changingposition, but one movement is necessary, a rotary movement of 'the tonearm extension, in order to place the reprodu'cer'in a position to playthe other type of record. As a matter ot' fact, assumingthat one usesthe type 'of needle which must be changed after each record is played nomore movement is necessary to insert a new needle. Thus the number ofmovements required to change the reproducer froma position to play onetype of record to the position to play the other type is reduced to theminimum;

When the reproducer has been changed to play hill and dale records, theneedle is, arranged at substantially the same angle to the record aswhen used in playing lateral cut` records, namely, substantially 55, andis positioned thesame distance from the axis of rotation of the tone armelbow. Also, it will be noted from Figure 3 that a :plane at rightangles to the diaphragm and passing. through the needle socketintersects the axis of rotation of the tone arm elbow. This feature. ofhaving the plane of the diaphragm pass through the axis of 'rotation ofthe tone arm when arranged to play lateral cut 1'ecords, and of being soposii tion'ed, when arran'ged to play hill and dale records, that aplane at right angles to the diaphragn through the needle socket passesthrough the axis of rotation of the tone arm is very desirable.-

It is also exceedingly desirable that the needleshould be`positioned thesame distance from the axis otrotation of the tone arm`elbow whenplaying one kind of record as when playing the other, as by thisarrangen ent the needle may. be *caused to engage therecordapproximately along the radius of` the record which extends atapproximately right angles to a line joining the axis of rotation of thetone arm to the needle. In` other words, the plane of the diaphragm ofthe reproducer of Figuresl and 2 will be positioned substantiallytangential to the record groove, and the plane at right angles tothereproducer diaphragm passing through the 'needle socket will besubstantially tangential to the record groove when arranged as inFigures 3 and 4. Of course, due to the arc which the needle travels inits movement from the outer' edge of the record toward thecenter, thistangential arrangement is not true for all positions but may beapproxinated for' all positions." y i p The modification shown inFigures 5 and G is verysimilarto that shown in Figures 1 to 4, theonlyadifi'erence' being that the tone arm elbow hasits laterallyextendingportion 35 arranged at an angle of less than to the Verticallyextending portion 36. Also,

the angularly extendin portion ST ot the tone arm extension 38 isarranged at a sli'ghtly diierent angle to thetonearn ,extension than arethe similar parte in Figures 1 to 4. The operation andresults obtainedby the structure of Figures 5 and' 6 isvery similar to that abovedescribed 'However, in changing from a position to play lateral cutrecords to a position to play hill and dale records, the tone armextension' need not `be rotated through so great an angle., It

will be recalled the I the tone arm extension 24 was rotatedsubstantially 180 in the change from a position to play lateral cutrecords to a position to play hill and dale records. In' the arrangementof Figures 5 and 6, the tone armextension need be ro tated only' about120. The arrangement ot' the extension 37 and the reproducer stem 39 isalso slightly different in that the extension 37, when in a position toplay lateral cut records, inclines slightly upwardly, and the reproducerstem 39 inclines slightly downwardly so that the axes ot' the soundpassage through the part 3-7 and through the part 39 are coincident. I

It Will be understood that the extension member 38 is telescopicallyreceived by the member 35, and that the reproducer stern 39 istelescopically received by the angularly extending member 37 in the samemanner as has been described in connection with F igure 1. e

The details of the telescopic arrangement between the parts of Figure 5are shown in F igures 10 and ll. In Figure 11, 40 indi cates the reducedportion of the extension member 38 which is received within the end ofthe member 35. If desired, the portion 40 may be provided with acircumferential groove 41 into which projects a screw 42 insertedthrough the member 35. This arrangement acts to prevent the tone armextension being withdrawn from the elbow, and also acts to limit therotary movement of one relative tothe other. In order that thefrictional engagement of these parts may be' maintained substantiallyconstant and take up the wear which occurs, the member 40 may beprovided with a groove 43 within which is placed a fiat spring 44 formedasthe arc of a circle somewhat smaller than the inner circumference ofthe member 35. I

In F igure 10 is shown the nature of the connection between the parts 39and 37. The reducedportion 45 of the part 39 may be provided with acircunferential groove 46 into which may project a screw 47 carried bythe part 37. This arrangement of Figures 10 and 11 may advantageouslybeapplied to the structure of Figures 1 to 4, although any othersuitable means may be substituted therefor.

, Asis usual the tone arm elbow 36 is so supported as to be rotatableabout its verc tical axis and also to permit the extension 35 to moveVertically to permit the needle to be placed on or removed from therecord, and also permit the needle to maintain a constant engagementwith the record while the record moves slightly up and down during itsrotary movement, as is usual. The details of the supporting means forthe 'tone arm elbow are shown hFigures 7, 8

and 9. The ball raceway of the supporting means' is formed `oi anannularring 49 which forms thebase of the raceway-and a housing member 50provided with a 'Vertically eXtending portion 51 which forms one'side ofthe ra'ceway and 'a laterally'extending'top portion 52 which overliesbut does not en'gage the ball ring 53. l'indicates one of the balls ofthe bearing.

Referring now to'Figure Sit will be noted that the 'member is provided'with -three pairs ot'punched out 'and downt'urned lugs 55. `Betweeneach pair of lugs is'positioned o'ne of the balls 54. Lugs 55 'actmerely to limitthe movement of the balls 54 and'insure that the tone armwillbe Suspended at'three points as* on a tripod. The tone arm elbow isprovided with an 'ofiset portion 56, and the ring`3 is=provided with acorresponding oti'sct portion 57. Aligned openings are provided intheoset portions 56 and 57' through which=extend the co'tter pins 58 and69. The cotter pin 59 is provided with a pair of washers (SO between'which ispositioned a spral springl, the whole being maintained on the'cotter pin by the 'end of the cotte'r pin 'arms being separated.Th'e'spring Gl acts tomaintain the tone arm elbow 36 in engagenent withthe ball ring 53.

`-I' desh-ethe spring, such as 61, may be placed-about each of thecotter pins. In stead'of employing the cotterpins shown in thedrawing asthe means for pivotally supporting the tone arni on -the ring, screwsmay be substituted, it being' onl y necessary to place each of thescrews through an openingin 'one ot the members and engage the screwthreaded 'portion of the screw with' a screw threaded opening in theother member.

T he' ball ring 53, it will be noted, as shown in Figure 7, is angularin formation and en ga'ges 'both the top and one side of the ball 54.However, the ring 53 through a portion of its ciroumference which isarranged to eng-age one o t'the balls 54 has a beveled i'ormation, asshown'in Figure 9. Ifdesir'ed,-the ring 53, where formed to ngage thethird ball, may beprovided with an arcuate engaging surface insteadotthe beveled engagng surface shown in Fignre 9. If desired, the ring 53may be provided with a tornation ot the general character ot' that shownin Figure 9 where it is arranged to eng-agetwo of the balls 5%, but the`arrangement wher-ein this contour is provided to enga ge' only one ballis believed to be preferable.

The base member 49. and the housing member 50 are provided with alignedopenings through which extend the hollow rivets The screws (33' whichsecure the tone arm to the instrument board may pass through the centerof the hollow rivets (32, thus securely aintaining all the partstogether.

In order 'to =limit the Vertical 'movement otthe tone arm,=the 'elbow36'is provided in'one side thereof with-a notch'or 'groove (Se intowhich projects a *lirg or point integral' with' the ring 53. Thcvertical n'overnent 'of the tone arm is 'limited by-the lugG enga'gingthe top and bottom respectivcly of the-grokwe i. In'order to lihnit therotary movemeut'oi' the tonearm, the ring-53 is provided with alug whichei;-

tends do'wnwardly 'into a n'otch''i' formed in the inner edge'of thebase n'ember %9. ?he engagement of the lug 66 with the ends o'l thenotch (37 operatesto limit the rotary movement 'of the tone arm in amanner which maybe readily understood.

in order to securethe bestresults, it is necessary to provide means forchanging the pressure of the'needie 'on 'the records when playingrecords of diiierent types. One of tlrewellknown records on themel-, etproduces 'best-results when the needle engages the record witha pressureof substantially 'our and oneflriarter ounces; another well known recordunder the most tavorable conditionshas the needle-arranged to 'enza gethe 'record with a pressure of about five and one-'quarter ou-nces;stillanother well known make ot record plays best when theneedle engegesthe-record with a pressure of *from six and one-h-alt to Seven ounces.Devices have been designed `for changing-thepressure of the needle onthe record, but many of these devices are objectionable -tor "variousreasons. Some of these prcssure changing devices are exceedingly heavy"and cmnbersome others art. to give a side thrus't to the tone arm;others have other inherent' objections. For this reason, manyof-thephonographs which are provided with: universaltone arms andreproducers merelyadjustthe pressure ot the needle about midway of thetwo extremcs and trust that the devicewil] `give Satisfactoryperformance with all the various types of records.

Applicant discloses *in Figures 7, l2 l?. and 14. a needle pressurechanging devite which is light in' weight, is nounted at the back of thetone arm where itis inconspicuous, and which does not 'act -to preduceany notice-able'side thrust on the tone arm. This niechanism comprises aweightcd lever 68^`which ispivotally secured'by means of the screw 69 tothe upwardly eztending bar 'TO` carried bythe ball 'ring 53, as shown inFigure 7. The bar 70 extends through a' slot 'ormed in the horizontalmember 52 ot' the hearing housing member 50. The tone arm, -at'the rearthereof, and substantiullv in the vertical plane which passes throughthe axis of the tonearnn is provided with u projecting lug 71. 'When theweighted lever 68 is turned to the left, as shown in Figure 12, itengages onthetop of the lug Il, pressing the rear portion of the tonearm elbow' downwardly and thus de'creasing the pressure on the needle.Due to the fact that a leverage' is obtained 'by the oonstruction thelug 'l.. When, however, theweight 68 is 'turned to its reverse position,as shown in Figure'l i, the'end of the lever 68 engages on the underside of'the lug 71 and tends to forcetherear side of the tone arm elbowupwardly, thus increasing the pressure of the needle point on therecord. The lug 71 is shown having a hearing point at the upper sidefarther from the pivot ,69 than is 'the hearing point on the lower side,so that the decrease in pressure due to placing the weight in theposition of Figure 12 will be less than the increase in pressure due toplacing the weight as shown in Figure 14.

' Instead of a lug'7l, as shown in the drawings, a single pin or asubstituted as required. i

In Figure 13, the weighted` lever 68 is shown in neutral position, thatis, in a position where it has noefl'eet on the pressure of the-needleon the record. In order to maintain the lever `'in this position, thebar is provided with an outwardlyjextending bead 72, and the end of the'lever 68, is provided with a depression 73 adapted to engage the beadand retain the'lever in its pair of pins may be inoperative position; 7\The engagement and disengagement of the' depre'ssion 7 3 with the bead72 is permitted, due to the resiliency of the bar-70. i j v `Thus, threedifferent pressures of the needle on the record may -be obtained by themeans disclosed one the normal pressure produced by the. uninfluencedtone arm, another the decreasedpressure due to the lever hearing do-wnon the rear of the tone arm elbow, and the third due to the leverbearingflupwardl on the rear 'of the tone arm elbow; If esired, the pinor lug on the rear of the elbow maybe made adjustable as by providing aseries of holes in the tone arm at-difierent distances from the' pivotof the lever in an one of which the pin may be placed. r nother mannerof adjusting the degree of influence which the weight' will have on theneedle pressure on the record is to adjustably mount the weight on theweight arm so that its distance from the pivot may be changed at will.Due to the leverage provided by' this structure, 'the pressure changingdevioemay be causecl to exert a pressure' on the tone arm. many timesgreater than its own weight.

It has been found that 'under certain conditions, a better quality I ofreproduction is 'produced by providing the tone arm with internalstrengthening webs which extend laterallyacross the sound channel. Thesewebs make the external walls of the tone arm more rigid by their bracingaction, and also operate to breakup the sound channel into a pluralityof channels so as to prevent the formation of sound eddies within thetone arm.

In -Figure 15, the sound arm elbow 75 is shown as provided' with at'ansverse s'trengthening web 76. The web '7 6 may be positioned withinthe sound arm elbow in any desired or preferred manner. One means whichapplicant has found Satisfactory is to form the web ofsheet metal,fibre, Or other suitable material, and then force it into the elbow tothe position indicated in F igures 15 and 17.

The tonearm extension' 77 of F igure 15 is shown provided with a pair ofstrengthening webs 78 and 7 9 which intersect eachother at right anglesalong the axis of the sound channel. The strengthening webs 78 and 79 inthe form shown in Figure' 16 may be formed by die casting the tone armextension and strengthenin webs. In this process,

the core usedi'n die casting will be the usual i cylindrical coreslightly tapered,-'but instead of being one integral mass, it willconsist of four qua'drants which are spaced slightly apart soas toprovide the spaces therebetween for the webs.. Insteadof theintersecting webs a single web may be used.

In Figure 18 a tone arm extension 80 is shown provided with theintersecting strengthening webs 81 and 82.' This structure is similar tothat shown in Figure 15 except the strengthening webs in thisarrangement are inserted in the tone arm eX- tension and are not diecast therein. The web plates 81 and 82 are formed of a size to fitwithin the extension arni, and each of themis then split for half of itslength, one from one end and the other from the other end along theiraXes. The two parts are then placed together with the slot of oneengaging the solid portion of the other in a manner which will be wellunderstood. Figure 20 shows one of the plates 81 provided with a slot83. The other one of the strengthening web plates 82 will be providedWith& similar slot, but it will be in the right half of the web pla teinstead of in the left half, as indicated in Figure 20. The webplatesf8l and 82 after being placed in the proper relative position mayberigidly Secured 'together by soldering along the line of intersection.i

Figure 21 shows a tone arm extension 83 provided with a singlestrengthening web 84:. Web 84 maybe formed of metal, fibre,

llO

or any other suitable or desired material.

g meg-,3%

will besnuglyinserted within the tone arm At the ends of the plate andextension, between the plate and; the wall of the tone arm' extensionare provided substantially semi-cylindrical blocks 86 and 87, one` on.

one sideand the other on the opposite side of' the strengthening web.84. Thiis, the sound entering the tone arm extension from the right inFigure 21 will be forced to pass on theelower side of-the web 84-, asseen in thisfigure, and upthrough the perforatons 85': within the web84. This strueture acts to break up` any soundg eddieswhich may;

y same manner as hlocks86 and 87.

The preferred embodiment of applicantis tone arm; and one modificationhave been described above. Many other modifieations are possible,butthese several modifications all consisttmerely in varying the anglesbetween the vertically extending portion of the tone arni; elbow and theforwardly ex: tending po'tion, changing the angle of the turn :in the`tone arin' extension and slightly ehanging the angle of the axis of the`tone exit channel tothe diaphragm. Modifications of the .needlepressnrechanging device are also possible; Qne ohvious modification-wonld be tto -pi;vet the' pressure varying leve:: to' the tone armandeanseit to engagea` pin earried by the .bar which projects upwardlyfroni the ball: rin-g. Other modifications of the idea would donbtles'spresent themselves to one skilled in the art. Applicant contemprla tesmodifieations other` than' those set forth above, and it is, therefore,totbe understoodthat; the invention is to be` limited merelyby--thescope of the appended claims.

- I-lavingnow describedmy invention, what I claim is newand desiretosecure by Letters Patent of the United States is:

l, In` a phonograph the combination of atonearm havingonee'nd looselyfitting within a collan with trunnionsjoining the tone arm to thecollarto permit: the tone 'arm tQJlQY; in' a vertical plane, the aX-isof said trunnions being parallel with but spaced from adiameter of saidcollar, the-por`tion of the tone arm within said; collar having twoopposite sides: of different curvatnre to pernit 'said arni tomovewithin and atall times adjacent to said -collarbut without touehi ngt. 1 r

2,. In; combination, a phonographtone arm, *ci-metal rllaa'` surroundingsaid tone arm, said eollar and tone. arn 'being provided withcorrespondingly pesitioned offset or fiattened parallelportions, andtrunnions extending through said par-allel portions respectivelywhe'ebysaid arm is Supported on said collar. e

3. Ina phonograph, the combination ofa tone arm having one end looselyfitting within a colla-r with trunnons joining the tone arm to thecollar to permit the tone arm to move 'in a vertical plane, the axis of-'said trunnions being arallel with but spaced from a diameterof saidcollar, the portion of the tonearinwithin. said collar. havingtwoopposite sides of different curvatures, the curvatures of said sidesbeing along the arcs of circles, the radii of which are thedistanees,respeetively, from said sides to said axis of saidtrunnions 4, In aphonograph, the combination of a tone' arm havingone end loosely fittingwithin a collar with trunnions joining the tone ar n to the collar topernit the tone arm to move in a vertical plane, the axis of' saidtrunnions being parallel with but spaced from a diameterxof; saidcollar, the portion of the tone arm within said collar having` twoopposite sides of different curvatures, the curvatures of saidsidesbeing along the arcs of circles, the-radi ofwhich are thedistances, respectively, from said sides to said axis of said trunnions,the portions of said tone arin within said collar a nd between saidopposite sides being-provided with surfaces, the curvature ofwhichIgradually changes from that of-one of said opposite `sides to that'oftheother. 4

5. In a phonograph, a tone arin, a support forsaid` tone' arm, apivotalconneetion between said tone arm and said snpport allowingmovement of the tonearm in" a vertical plane, a projection from saidtonearin, an:: otherproject-ion from said' support, and a weighted le verpivoted to one of said projections' and capable of engagement witheither the top or bottom. of the other said projection.

6.' In a phonograph, a tone arm, a support on which saidton armispivotally mounted', and-a weighted'lever pivotally join'ed to saidsupport and eapable of being placed' in either of three positions," aneutral position wherez'it is supported'entirelv by said-support, a`secondposition-where it engages the tonearin so astto forcethe' adjacent portion ofthe tone arm downwardly, and a third position where itengages the tone arni so as to force the' adjacent portion of: the tonearm upwardly.` i

'7. In a phonograph, a: tone arm, a support on which saidtone arin ispivotally mounted, a weighted lever pivotallyz supported-on saidsupport, andja projection extending outwardly from the real* surface ofsa d a m,- sad weighted lever. being' so arranged that' in one positionit may engage said projeoton upon the top thereof, and in anotherposition engage said projection on the bottom thereof, the portion ofsaid projection engaged by the arm in one position being farther fromthe pivotal support of said arm than the point engaged by said :me whenin the other position.

8. A phonograph tone arm, a strengthen- 10 ing Web postioned within saidtone arin,

said Web being provided With a pluralty of openings, and means forolosng the passage' between opposte ends of said Web and the tone arinon the opposite sides of said web.

In Wtness Whereof, I hereunto subscribe 15 my name this' 2lst day ofMarohyl922.

ROLAND B. DALEY.

Vitnesses DAGMAR PETERSON,

EMILE J. BOURGEOIS.

